If anyone missed any of these along the way when they were free or cheap, try your public library. I noticed that mine has a lot of Poisoned Pen Press ebooks in the Freading library. It's painful to use, but an advanced search for publisher should help.

Description
After a second World Championship in four years, the Boston Red Sox have finally buried the Curse of the Bambino or have they? Sox owner Louis Kenwood receives an extortion note signed Babe Ruth claiming that the 2004 World Series was fixed and demanding $50 million to keep the information from getting to the press and the Commissioner’s office. If the allegation of a fix becomes public, Kenwood fears irreparable damage to the value of his franchise and to his legacy as Lucky Louie, a the man who finally brought a championship to Boston after 86 years. Thus, the Red Sox turn to private detective Sam Skarda to find out who’s behind the extortion plot. Kenwood insists that his beautiful executive assistant Heather Canby accompany and monitor Sam on every step of his investigation. Unsure whom he can trust, Sam follows the clues to the Los Angeles underworld and then to the slums of Venezuela. Can he assemble all of the pieces to this puzzle before more lives are lost and scandal blasts the Red Sox Nation? Green Monster is the second novel in the Sam Skarda series, following Amen Corner.